Refactor python algorithm import (#5657)

* Python research import improvements

- Improve start.py for research env
- Remove unrequired imports

* Centralize algorithm imports

* Add regression test GH action

* Unit test python import clean up

* Join research and main imports

* More python import clean up

* Fix failing skipped regression algorithm

Algorithm.Python/BasicCSharpIntegrationTemplateAlgorithm.py

@@ -11,17 +11,7 @@
 # See the License for the specific language governing permissions and
 # limitations under the License.
 
-from clr import AddReference
-AddReference("System")
-AddReference("QuantConnect.Algorithm")
-AddReference("QuantConnect.Common")
-AddReference("System.Windows.Forms")
-
-from System import *
-from System.Collections import *
-from QuantConnect import *
-from QuantConnect.Algorithm import *
-import numpy as np
+from AlgorithmImports import *
 
 class BasicCSharpIntegrationTemplateAlgorithm(QCAlgorithm):
 
@@ -44,4 +34,4 @@ class BasicCSharpIntegrationTemplateAlgorithm(QCAlgorithm):
 
             ## Calculate value of sin(10) for both python and C#
             self.Debug(f'According to Python, the value of sin(10) is {np.sin(10)}')
-            self.Debug(f'According to C#, the value of sin(10) is {Math.Sin(10)}')
+            self.Debug(f'According to C#, the value of sin(10) is {Math.Sin(10)}')